3x+6y-5=0,则2x+4y+6是多少?

已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 （X+Y)^2 X^2Y+XY^2注：*/* 是分数 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 若5x+3y=3x+4y=x+2y+6,则x+y=___ 已知|5x-y-8|+(7y-x+2)=0则4x+6y 设实数x,y适合等式x*2-4xy+4y^2+√3x+√3y-6=0,则x+y的最大值是, 已知实数x,y满足x^2+y^2-6x-8y+24=0,则3x+4y-10的取值范围是 若x^2+y^2-6x+8y+25=0 则y/x-x/y的值是 x、y是自然数,规定x@y=4x-3y,那么5@6=? y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. 1、把二元一次方程6x-5y的x用含y的代数式表示出来的是__________2、已知|x-8y|+2（4y-1）²+3|8z-3x|=0,则x+y+z=________3、方程组｛4x-y=k 2x+3y=1｝中x、y的值相等,则k=____________4、方程组｛x+y=5k x-y=9k｝的 （5x-6y)(x+y)=0(x不等于y),则y/x= x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6